Regular Expression in Asp.net for Folder Name

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4.00/5 (1 vote)

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I want to validate a string that is used to create a folder.
so I want to restrict user from entering characters like \ / : ? " < > |
this characters will down the folder creation.
Can anyone help me by giving me the regular expression to validate this characters?

Thank You
[edit]removed white spaces[/edit]

Posted 7-Apr-11 17:59pm

kishore Rajendran

Updated 7-Apr-11 19:15pm

m@dhu

v2

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2 solutions

Solution 2

Anvas has the right idea, but .NET provides two methods which return the illegal characters for a file and a path, which you should use instead of defining your own:
GetInvalidPathChars [^]
GetInvalidFileNameChars[^]

if (myFileName.IndexOfAny(Path.GetInvalidFileNameChars()) != -1)
   {
   // Illegal character in file name
   }

Using these provides better portability than specifying your own.

Posted 7-Apr-11 20:10pm

OriginalGriff

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anvas kuttan · Accepted Answer · 2011-04-07T18:05:00

Solution 1

C#

string abc = "anvas the realnapster /";
char[] SpecialChars = "\/:?<>|".ToCharArray();
int indexOf = abc.IndexOfAny(SpecialChars);
if (indexOf != -1)
{
    //there should a special char in the string
}
else
{
    //string is fine
}

Posted 7-Apr-11 18:05pm

anvas kuttan

Updated 7-Apr-11 19:09pm

v2

Comments

Albin Abel 8-Apr-11 1:09am

Simpler than reg Ex. My 5

Sandeep Mewara 8-Apr-11 1:19am

My 5! Good solution.